[1000mp] Noise on MKV RX Audio

[W7RY]

Directly across the leads to the fan as close to the fan as possible.
Observe polarity.

If that does not work, try installing a small choke in series with the
fan. Then put the cap across the "output" of the choke. Again, as close
to the fan as possible. 

73
Jim W7RY


-----Original Message-----
From: 1000mp-bounces at mailman.qth.net
[mailto:1000mp-bounces at mailman.qth.net] On Behalf Of D. J.
Sent: Wednesday, December 14, 2005 1:28 AM
To: All about Yaesu 1000mp
Subject: Re: [1000mp] Noise on MKV RX Audio


On 13, Dec 2005, at 19:11, Paul Baldock wrote:

> At 09:14 PM 12/11/2005, you wrote:
>
>> My guess it that the fan itself is AC.
>
> I borrowed another MKV and it exactly like mine, in that the fan  
> injects noise in to the 13V supply and that noise modulates a  
> received signal. i also noted that when on SSB transmit there is  
> audio on the 13V supply.
>
> So I guess the answer is "they all do it". The question is should I  
> fix it? Probably a nice big cap in the right place would do it.
>
> Paul
>
>


Let's fix it.  Where do we put the cap?
dale



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